* doc/lispref/frames.texi (Display Feature Testing): Add indexes.

3 files changed, 4 insertions, 1 deletions

diff --git a/doc/lispref/ChangeLog b/doc/lispref/ChangeLog
index cd39f44fc98..29ab28c0fad 100644
--- a/doc/lispref/ChangeLog
+++ b/doc/lispref/ChangeLog
@@ -1,6 +1,6 @@
 2013-08-13  Xue Fuqiao  <xfq.free@gmail.com>
 
-        * frames.texi (Display Feature Testing): Add an index.
+        * frames.texi (Display Feature Testing): Add indexes.
 
 2013-08-12  Glenn Morris  <rgm@gnu.org>
 
diff --git a/doc/lispref/frames.texi b/doc/lispref/frames.texi
index 00cf4dc6be4..370098c8b62 100644
--- a/doc/lispref/frames.texi
+++ b/doc/lispref/frames.texi
@@ -2403,6 +2403,7 @@ Values can be the symbols @code{always}, @code{when-mapped}, or
 when the question is inapplicable to a certain kind of display.
 @end defun
 
+@cindex SaveUnder feature
 @defun display-save-under &optional display
 This function returns non-@code{nil} if the display supports the
 SaveUnder feature.  That feature is used by pop-up windows
diff --git a/lisp/frame.el b/lisp/frame.el
index 31a9123503d..79394bd305b 100644
--- a/lisp/frame.el
+++ b/lisp/frame.el
@@ -1442,6 +1442,8 @@ monitor, use `display-monitor-attributes-list'."
 
 (declare-function x-display-backing-store "xfns.c" (&optional terminal))
 
+;; In NS port, the return value may be `buffered', `retained', or
+;; `non-retained'.  See src/nsfns.m.
 (defun display-backing-store (&optional display)
   "Return the backing store capability of DISPLAY's screen.
 The value may be `always', `when-mapped', `not-useful', or nil if